With a 31" draw, I try to have everything I can past the shelf and it ain't much, especially if I've had to trim an arrow back a little after hitting something harder than I was supposed too! I don't think the draw check length is a good idea in my oppinion, you get a giant bull or buck in front of you and you might pull a little farther than usual and dislodge your arrow from the string when the broadhead hits the shelf or your finger and if you have a magnus stinger on, with the backside of the blade being sharpened, you might get an owie.